Khawaja's timely ton puts Australia on top

Usman Khawaja hit his country's first century of the series and Peter Handscomb a half century on debut as Australia reached 307 for six with a lead of 48 at end of the second day of the day-night third Test against South Africa on Friday.

Khawaja's magnificent 285-ball 138 not out was the glue in Australia's innings, the left-hander putting on 137 with Steve Smith until his captain was calamitously run out and then 99 with Handscomb.

Kyle Abbott (3-38), who took two wickets in the first hour, returned to dismiss Handscomb before Kagiso Rabada bowled another debutant, Nic Maddinson, for a duck and Vernon Philander removed Matt Wade for four.

Khawaja will resume with Mitchell Starc (16 not out) on day three as the hosts look to extend their lead and put themselves in a commanding position to get the result they need to avoid a first ever 3-0 series sweep on home soil.

Now 29, Khawaja has been recalled and discarded with regularity since his debut in 2011 but was retained for Adelaide despite the clearout that followed the humiliating innings and 80-run defeat in Hobart.

After opening in place of David Warner in the wake of South Africa's declaration on 259-9 on Thursday, he negotiated a difficult opening hour on Friday before mixing fierce concentration with some typically elegant strokes.

He brought up his 50 with back-to-back fours and his fifth test century with a 10th boundary cut through point, whipping off his helmet to take the applause of another big crowd at Adelaide Oval.

Smith, dropped earlier by Hashim Amla, had departed for 59 just before his partner reached the milestone, tearing off for an optimistic single and left stranded as Khawaja stood his ground and Quinton de Kock removed the bails.

Handscomb, brought into the side on the back of a double century for Victoria, proved a more than able partner, however, and any prospect of another Australian batting collapse quickly dissipated.

SCORES IN BRIEF

SOUTH AFRICA: First innings 259 for 9 decl

AUSTRALIA: First innings 307 for 6 (Khawaja 138 not out, Smith 59, Handscomb 54; Abbott 3-38)